An acronym for the interjection "Jesus Christ Superstar!" First made popular in 2008 by *Raura Lunterberg (name changed) of RVA to avoid alienating the bible-thumpers who populate the 804. Also a sarcastic reference to the 1971 musical "Jesus Christ Superstar."
"jcs" is often said in place of "oh my god", "omg", "goddamn it", "shut up!", "wow!", and "jesus christ!"

n.b. The "spin-off" phrase "Jesu Christi Superstar" may be used in formal situations or circumstances requiring extra sarcasm/snarkiness.